Update pfsense.md (#8544)

* Update pfsense.md

Note about Python package when installing on pfSense 2.4.5

* Update packaging/installer/methods/pfsense.md

Co-authored-by: Joel Hans <joel.g.hans@gmail.com>

packaging/installer/methods/pfsense.md

@@ -32,7 +32,9 @@ pkg add http://pkg.freebsd.org/FreeBSD:11:amd64/latest/All/netdata-1.20.0_3.txz
 
 **Note:** If you receive a `Not Found` error during the last two commands above, you will either need to manually look
 in the [repo folder](http://pkg.freebsd.org/FreeBSD:11:amd64/latest/All/) for the latest available package and use its
-URL instead, or you can try manually changing the netdata version in the URL to the latest version.  
+URL instead, or you can try manually changing the Netdata version in the URL to the latest version.
+
+**Note:** On pfSense 2.4.5, Python version 3.7 may be installed by the system, in which case you should should not install Python from the FreeBSD repository as instructed above.
 
 You must edit `/usr/local/etc/netdata/netdata.conf` and change `bind to = 127.0.0.1` to `bind to = 0.0.0.0`.